Time Dependant Weld Shape in Ar-O2 Shielded Stationary GTA Welding

材料科学技术（英文）, 2007, 23(5): 650-654.

^1, , ^2, , ^3, , ^4,

1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Chian

2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Chian

3.Joining and Welding Research Institute, Osaka University, Osaka567-0047, Japan

4.Joining and Welding Research Institute, Osaka University, Osaka567-0047, Japan

基金项目: the 21st Century COE Program, ISIJ research promotion grant the Japan Space Utilization Promotion Center (JSUP) JFE 21st Century Foundation the New Energy and Industrial Technology Development Organization (NEDO) the program of Ministry of Economy, Trade and Industry (METI)

Time Dependant Weld Shape in Ar-O2 Shielded Stationary GTA Welding

Keywords： Marangoni convection

The stationary gas tungsten arc welding (GTA) is carried out on SUS304 stainless steel under Ar-0.1%O2 and Ar-0.3%O2 mixed shielding to observe the evolution of the molten pool and investigate the role of Marangoni convection on the weld shape. After welding, the oxygen content in the weld metal was measured by using an oxygen/nitrogen analyzer. Small addition of oxygen to the argon based shielding gas can effectively adjust the weld pool oxygen content. Oxygen plays an important role as an surface active element in determining the pattern of Marangoni convection in the stainless steel weld pool. When the weld metal oxygen content is over the critical value, 0.01 wt pet, corresponding to the Ar-0.3%O2 mixed shielding gas, the Marangoni convection changes from outward to inward direction and the weld shape dramatically changes from wide shallow shape to narrow deep shape.

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Time Dependant Weld Shape in Ar-O2 Shielded Stationary GTA Welding

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